I may be wrong so pls correct me if so ... UPS boxes provide a way to connect using USB or serial ports. There are two types of UPS's ... smart and dumb ... smart UPS boxes provide a lot of information about voltage and battery life ... you will need to know the protocol that it uses to be able to hook into when it turns off/on. Dumb UPS boxes have a published protocol and there are linux daemons that can be used without any change to run these boxes. An example of one such daemon is powstatd ...
inittab has entries in it that will allow you to take actions when a power outage occurs and you move to battery back up ... please note that this will be called only when the UPS daemon is running ... it also provides ways to come back alive if power is restored during shutdown of your server. You could do something creative like tell the UPS to shutdown and come back on after 1 hour to see if power has been restored. Otherwise you can shut down cleanly again, though I am not sure if you can do this with a dumb UPS ... Hope this helps ... regards Saravanan -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Reuben D. Budiardja Sent: Wednesday, October 22, 2003 8:09 AM To: [EMAIL PROTECTED] Subject: Dealing with Power Outage: How to Shutdown cleanly Hello, We just had another 4 hours power outage here on campus last night. Some of our servers and linux clusters were on UPS, but of course they failed after a while and uncleanly/crash shutdown. No one was here when this happens, since we're don't have big IT support for the department, and pretty much I'm the only guy who does the admins for the servers and cluster. I didn't even realize we got a power outage until I came in late last night to pick up something, and had to reboot and manually run fsck for some of the workstation. What a pain.. This got me to thinking. Is there any way that a better UPS can help this situation. I see that some UPS has an RS232 interface or USB, and some software that can shutdown the machine on sustained power outage. I am wondering if this can be done also with Redhat linux 7.x, and 9. What I want is just somehow the UPS to signal the computer that it's on battery and either the a script or UPS itself shut the machine down whenever it is on Battery. I'm really ignorant on this case here, so any help is greatly appreciated. Also, if there're recommendation for those UPS that works well with linux. Thanks. RDB -- Reuben D. Budiardja Department of Physics and Astronomy The University of Tennessee, Knoxville, TN --------------------------------------------------------- "To be a nemesis, you have to actively try to destroy something, don't you? Really, I'm not out to destroy Microsoft. That will just be a completely unintentional side effect." - Linus Torvalds - -- redhat-list mailing list unsubscribe mailto:[EMAIL PROTECTED] https://www.redhat.com/mailman/listinfo/redhat-list -- redhat-list mailing list unsubscribe mailto:[EMAIL PROTECTED] https://www.redhat.com/mailman/listinfo/redhat-list
